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New Delhi, Apr 24: The trajectory of COVID-19 cases could have plateaued and might even fall for some weeks after the lockdown is lifted but India is likely to see a second wave in late July or August with a surge in the number of cases during the monsoon, say scientists.

The timing of the peak will depend on how India is able to control physical distancing and on the level of infection spreads after restrictions are relaxed, they said.

It looks apparent that the trajectory of daily new cases has reached a plateau and eventually it will take a downward fall, maybe for some weeks or even months, Samit Bhattacharya, associate professor at the Department of Mathematics, Shiv Nadar University, said.

Still, we may get a surge of new cases of the same coronavirus and this will be considered a second wave, Bhattacharya explained.

The second epidemic may come back in late July or August in the monsoon, although the peak timing will depend on how we control social distancing during that time, he said.

Rajesh Sundaresan, professor at Bengaluru's Indian Institute of Science (IISc), agreed.

“Once we return to normal activity levels, there is a chance that infection may begin to rise again. China is seeing this to some extent post easing of some restrictions on travel,” Sundaresan, corresponding author of a working paper by researchers at IISc and the Tata Institute of Fundamental Research (TIFR) in Mumbai, said.

On March 25, when the number of coronavirus cases was 618 with 13 deaths, the government announced a nationwide lockdown that was later extended to May 3.

On Friday, the death toll due to COVID-19 rose to 718 and the number of cases to 23,077, according to the Union Health Ministry.

In good news, officials said this week that the doubling rate of cases has slowed down in the period, going from 3.4 days before lockdown to 7.5 days, with 18 states doing better than the national average. The recovery rate has also almost doubled in the last 10 days.

"Looking at the new cases in the past few days, it seems the growth of new daily infection is much slower than earlier. This apparently indicates that we might have reached at the plateau of the growth curve, Bhattacharya said.

He noted that recent studies in China and Europe observed that the infection might relapse in those people who have already recovered from earlier phases.

So, there is no evidence that the earlier infection may help acquire immunity against the second infection. And in that way, the entire population may be vulnerable to the second wave to some extent, said the scientist.

In their study unveiled this week, IISc and TIFR researchers analysed the impact of strategies such as case isolation, home quarantine, social distancing and various post-lockdown restrictions on COVID-19 that might remain in force for some time.

The study modelled on Bengaluru and Mumbai suggests the infection is likely to have a second wave and the public health threat will remain, unless steps are taken to aggressively trace, localise, isolate the cases, and prevent influx of new infections.

The new levels and the peaking times for healthcare demand depend on the levels of infection spreads in each city at the time of relaxation of restrictions, they said.

The lockdown is currently upon us. It has given us valuable time. Let us test, trace, quarantine, isolate, practice better hygiene, search for a vaccine, etc. We should do these anyway, and these are being done. When and how to lift the lockdown is going to be a difficult decision to make, said Sundaresan.

It's clear that it's going to be phased. What our team is focusing on is to come up with tools to help the decision makers assess the public health impact of various choices, he said.

According to the experts, infectious diseases spread via contact between infectious and susceptible people. In the absence of any control measures, an outbreak will grow as long as the average number of people infected by each infectious person is more than one.

Once enough people are immune there will be fewer people susceptible to the infection and the outbreak will die.

However, when an outbreak is brought under control by social distancing and other interventions, it is possible only a small proportion of the population will have been infected and gained immunity, they said.

This means enough susceptible people may remain to fuel a second wave if controls are relaxed and infection is reintroduced.

Until the vaccine comes on the market, we have to remain alert Once sporadic cases occur here and there in the country, we immediately need to implement quarantine or social distancing locally for the people in that region, and also need to perform tests to identify positive cases irrespective of showing symptoms, Bhattacharya explained.

Note that these monsoon months are also flu season in many places of India. So, we should not ignore the early signs of the flu symptoms. Irrespective of symptoms, we need to increase tests in the hotspots to identify people and contain the surge, he said.

Sundaresan added that the timeline for a second wave will depend on a lot of circumstances which may change as the time passes.

Significant testing may have been underway, there may be behavioural changes with people becoming more careful about their hygiene, wearing masks may become more common, etc. All these responses may help restrict the second wave, he said.

A study published in The Lancet journal earlier this month modelled the potential adverse consequences of premature relaxation of interventions, and found it might lead to a second wave of infections.

The finding is critical to governments globally, because it warns against premature relaxation of strict interventions, the researchers said.

While interventions to control the spread of SARS-CoV-2 are in place, countries will need to work toward returning to normalcy; thus, knowledge of the effect of each intervention is urgently required, they said in the study.

According to a recent analysis by the Harvard Chan School of Public Health, the best strategy to ease the critical care burden and loss of life from COVID-19 might be on-again, off-again social distancing.

In the absence of such interventions, surveillance and intermittent distancing may need to be maintained into 2022, which would present a substantial social and economic burden, the researchers wrote.p

Kolkata, Mar 25: Amid the countrywide lockdown in the wake of coronavirus outbreak, Chief Minister Mamata Banerjee on Wednesday said that all police stations will take responsibility to deliver food at doorsteps under the supervision of District Magistrates and Police Superintendents.
"As we have to ensure that there is no scarcity of food, all Police stations will take responsibility to deliver food at doorsteps and it will be monitored by District Magistrates and Police Superintendents," said Banerjee at a press conference here.
She also said that under the social pension schemes, the pension holders will get their pension of March and April together.
Speaking on local police blocking people involved in essential services, she said, "The Officer-in-charge will have to ensure that the local police know about the rules and exemptions during the lockdown."
"If any police official or an administrative official is found flouting the lockdown norms, then strict action will be taken against them," she added.
The Chief Minister also said, "If somebody needs to help us by giving materials then they need to contact health department official Sanjay Bansal, whose contact number is - 9051022000."
"The government has also launched a State emergency relief fund wherein people can donate. For donation, the account number is 628005501339, IFSC: ICIC0006280 and website: wb.gov.in," she said.
She also said that on March 31 the government will review the situation.
According to a recent update by the Ministry of Health and Family Welfare, a total of 562 positive cases for coronavirus have been confirmed in the country.

New Delhi, Feb 25: Condemning the violence in Delhi, the Congress on Tuesday demanded that the Prime Minister, the Home Minister and the Chief Minister of Delhi come forward to ensure peace and maintain brotherhood while rising above partisan politics.

"This is Gandhi, Nehru, Patel's India, can any Indian accept this mindless violence? Congress appeals to the people of Delhi to maintain communal harmony and thwart all attempts of the forces dividing the country on the basis of religion," Congress' chief spokesperson Randeep Surjewala told reporters.

Unabated violence and incidents of stone-pelting and murder in the national capital have shattered the nation, he said, while referring to the riots in northeast Delhi over the Citizenship (Amendment) Act that continued for the third day, and demanded stern action against the culprits.

"Our appeal to the prime minister, the home minister and the Delhi chief minister is, can you rise to the occasion, leave aside your political partisanship and views, and become really not leaders of your parties but leaders of the society so that harmony, peace, and non-violence prevail," he said.

The Congress party will stand with the Centre and the Delhi government in every way to maintain brotherhood and harmony in the society, he said.

"Do not fail this country because you belong to different political parties," Surjewala said, adding this was a sincere appeal "on behalf of people of Delhi and the country" to Prime Minister Narendra Modi, Home Minister Amit Shah and Chief Minister Arvind Kejriwal.

"There is no place for violence in Gandhi ji's India... Today there is a need to establish peace on the ground and maintain brotherhood," he said.

Surjewala said the party also prays for the speedy recovery of DCP Amit Sharma and the hundreds of other people who have been injured in the violence.

"We also condemn the firing at three journalists Arvind Gunasekar, Saurabh Shukla and Akash and pray for their good health," he said.

"We strongly condemn these brutal riots and demand that the culprits are identified and stern action is taken against the real culprits and miscreants. The Congress mourns the death of Head Constable Ratan Lal and others in the violence," Surjewala said.